TM 9-4935-481-14-1
C2
(e) The test mode switch expands the signal capacity of J1, and in the cont sig comptr position applies a +24 Vdc
seen in the DMS-G schematics.
command to the DMS-D. This command sets up the remote control of DMS-D functions as discussed later. Each of the 12
(a) The reset/off switch controls the reset pulse generator on card 2A1. When the switch is placed in the reset
decks (A through L) of the switch are double-pole six position. The common of each of 22 of the 24 poles are connected to
position, a 125 31 msec pulse is generated. This pulse goes from a high logic level to a low level and returns high. A
individual contacts of J1. Although two positions of each pole are not now used, the six possible positions allow up to 132
similar pulse is generated in the DMS-D each time the tracker test set section test start switch is operated. Logic gates on
circuits to be connected to the 22 contacts of J1. Common "1" of deck K is the remote command to the DMS-D. During
card 2A1 receive these independent pulses and apply them to DMS-G UUT interface connector Jl-B94.
CSCB testing, it enables the DMS-G frequency switch to control the DMS-D low frequency oscillator. Common "1" of deck
"L" is connected to power ground. In the cont sig comptr position, this applies power ground to DMS-G connector P1-14. P1
(b) Test control 21 is a binary switch connected to both DMS-G UUT connector J1 and DMS-G card 2A2. The
is the connector on the DMS-G front panel which mates with the CSCB, and is similar to the Dragon launcher connector. For
direct connection to J1 is used when testing TTS card 1A8, for which the switch simulates the MTS frequency switch. A
safety purposes (when used on the launcher), P1 pins 14 and 15 are shorted to the connector shell except when a tracker is
binary decoder on card 2A2 receives the "1" output of the "tens" section of the switch and the "1", "2", "4", and "8" outputs of
installed. The circuit through the test mode switch prevents the shorting of power ground to the P1 shell and the DMS-G front
the "units" section. As test control 21 is set between 01 and 16, the binary outputs are converted to 16 discrete signals.
panel (which would create an undesirable ground loop). Insertion of the CSCB into P1 opens the circuit to the connector
These signals, provided on separate wires, are a high logic level except that the wire associated with the number set on the
shell.
test control switch is "low". Application of a +5 Vdc "invert" command on DMS-G UUT connector J1-A77 reverses the
high/low condition of all signals. The discrete outputs are used during tests of DMS-D cards A5, A12 and A15.
(2) Control-signal comparator. With the exception of the detector A and detector B controls, functions of the other
controls can be easily seen in the DMS-G schematics. Detector A and detector B controls program the outputs of the DMS-D
(c) The 13 volt power used for UUT operation is provided by regulators in the DMS-G. Regulator input power is
tracker detector simulator and direct the routing of the simulator signals to the CSCB. In the DC bias and gnd positions, the
the 24 Vdc generated in the DMS-D. During troubleshooting and when required by the procedure, the operator can vary
inputs to the CSCB are generated in the DMS-G. In the DC bias position, the detector A control energizes the DMS-G relay
the power by placing the control to ADJ and positioning the +13V and -13V controls to obtain the desired voltage. As the
TB-6 K1 and the detector B control energizes K2. When energized, these relays remove the detector simulator signal from
switch is changed from adj to fixed or back there is a momentary opening of the sense circuit. When this happens, the
the CSCB and apply the DC bias. The bias signal is applied to TB-6 E5 from the DC bias potentiometer. When positioned to
regulator will momentarily set the output voltage at a maximum level. To prevent damage to a UUT by this transient,
gnd, the detector A switch energizes relay K3 and detector B switch energizes K4. When energized, these relays connect the
resistors R7 and R8 have been placed directly on the regulator between the out terminals "S" and "C". These resistors cause
CSCB detector input to ground through 1 megohm resistors TB-6 R1 and R2. During tests of the CSCB AGC circuitry, the
the voltage to decrease as the switch is operated.
signal level must be increased and the resistors are bypassed. This is done by positioning the clutch/ref gen control on.
(d) The power control is a 24 pole switch which interrupts all input power and many stimuli routed from the DMS-
When on, this control applies +24 Vdc to TB-6 E15, which energizes relays K1, K2, K3, and K4 through diodes CR1, CR2,
D. The press-to-test circuit of the indicator lamp is connected to the input side of the switch and functions with the switch
CR3, and CR4 respectively. Contacts of relays K1 and K3 bypass
either ON or OFF. Positioning the switch to the OFF position enables the operator to install or remove the adapters from J1
or the UUT's from an adapter without turning the DMS-D off. Thus the DMS-D electronics remains ready for operation (no
3-34